<?php
 if (!empty($_SERVER['HTTP_CLIENT_IP'])) 
 {
   $ip=$_SERVER['HTTP_CLIENT_IP'];
 }
 else if (!empty($_SERVER['HTTP_X_FORWARDED_FOR']))
 {
  $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];
 }
 else
 {
   $ip=$_SERVER['REMOTE_ADDR'];
 }
 echo $ip;
?>